| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 3.22 | 3.51 | 3.09 |
| 2024 | 3.19 | 3.79 | 2.7 |
| 2023 | 3.84 | 5.12 | 2.89 |
| 2022 | 3.38 | 4.81 | 2.7 |
| 2021 | 5 | 7.08 | 3.92 |
| 2020 | 5.86 | 16.4 | 2.34 |
| 2019 | 2.63 | 3.4 | 2.21 |
| 2018 | 2.95 | 4.06 | 2.14 |
| 2017 | 8.81 | 14.03 | 3.06 |
| 2016 | 13.1 | 14.57 | 11.14 |
| 2015 | 15.48 | 21.2 | 9.87 |
| 2014 | 10.15 | 15.94 | 6.68 |
| 2013 | 6.73 | 7.68 | 5.83 |
| 2012 | 5.17 | 6.1 | 4.37 |
| 2011 | 6.66 | 8.62 | 4.64 |
| 2010 | 6.83 | 9.13 | 4.62 |
| 2009 | 4.96 | 7.1 | 3.09 |
| 2008 | 4.3 | 7.69 | 2.18 |
| 2007 | 6.36 | 9.39 | 4.76 |
| 2006 | 3.36 | 5.54 | 1.76 |
| 2005 | 1.69 | 2.23 | 1.23 |
| 2004 | 1.99 | 2.65 | 1.55 |
| 2003 | 2.81 | 3.72 | 1.85 |
| 2002 | 4.59 | 5.26 | 3.95 |
| 2001 | 6.64 | 8.19 | 4.72 |
| 2000 | 6.93 | 8.12 | 6.15 |